Quarterly journal of Conchology. 315 



form a region apart. A\"e here find a comparatively extensive fauna 

 considering the small size of most of the islands, but an absence 

 of any conspicuous shells. 



The Hd/icidce, like those of New Caledonia, are very small, 

 the sections with internal lamellie being however numerous here. 

 Placostylus and Amphidroinus have both disappeared. The large 

 NaniiuE are no longer met with, and we have finally taken leave 

 of the fine Indo-Malayan genera of Cydosfomidcc. On the other 

 hand, Parfiila becomes very numerous, and with Trochomorpha 

 furnishes the only shells even approaching to a moderate size. 

 TornatelU.na has a good many species, and amongst the opercul- 

 ates there are various forms of Diploiiiinatinidcc {Falai/ia, Mous- 

 sonia, etc.), of Cydophoridce ( Ostodes ) and many species oi Realia^ 

 all small shells. 



A. Samoa Islands. These and the Tonga Islands have, like 

 the Fijis, been explored by Dr. Graeffe, and the results, as far as 

 the land and freshwater shells are concerned, have been published 

 by Prof Mousson in the "Journal de ConchyHologie." From the 

 smaller size and lesser number of the Islands, it is probable that 

 Dr. Graeffe has been able to approach much nearer to discovering 

 the complete fauna than in the case of the Fijis. One species has 

 been referred to AmpJiibuliina, rather doubtful. There is also 

 Microcystis, etc., 8, Patula 2, Fitys 3, TrocJioiiiorpJia 6, Ste/iogyra 

 I, Partula 13, Tornatcllina 2, Cy clot us i, Mousson ia i, Ostodes 6, 

 Realia 7, Helicina 3. 



B. Tonga Islands. The genera and many of the species are the 

 same as those of Samoa. It is remarkable that only one species 

 of Partula has been found. 



C. Cook's Islands. Here 3 species of Diade/ua, one each of 

 Chondrella., Palaina and Cydoinorpha are remarkable. There are 

 16 species oi Pitys. The other genera are but poorly represented. 

 Microcystis 1, Trochomorpha 3, Partula i, Tornatellina i. Pupa i, 

 Helicina i, Cyclophorus i, Realia d^. 



